﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Principal;
using System.Web;

/// <summary>
/// Extension methods and other helpful utility methods.
/// </summary>
public static class Utilities {
	/// <summary>
	/// Gets the database entity representing the user identified by a given <see cref="IIdentity"/> instance.
	/// </summary>
	/// <param name="identity">The identity of the user.</param>
	/// <returns>
	/// The database object for that user; or <c>null</c> if the user could not
	/// be found or if <paramref name="identity"/> is <c>null</c> or represents an anonymous identity.
	/// </returns>
	public static User GetUser(this IIdentity identity) {
		if (identity == null || !identity.IsAuthenticated) {
			return null;
		}

		return Global.DataContext.Users.SingleOrDefault(user => user.OpenIDClaimedIdentifier == identity.Name);
	}
}
